4.7 Article

Mechanical properties of rolled and aged AA6061 sheets at room-temperature and cryogenic environments

期刊

JOURNAL OF ALLOYS AND COMPOUNDS
卷 860, 期 -, 页码 -

出版社

ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2020.158449

关键词

AA6061 sheet; Rolling; Aging; Cryogenic temperature; Precipitation strengthening

资金

  1. National Key Research and Development Program [2019YFB2006500]
  2. National Natural Science Foundation of China [51674303]
  3. National Youth Thousand Plan Program of China
  4. Huxiang High-Level Talent Gathering Project of HUNAN Province, China [2018RS3015]
  5. Innovation Driven Program of Central South University [2019CX006]
  6. Research Fund of the Key Laboratory of High Performance Complex Manufacturing at Central South University of China

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The study found that as the rolling reduction ratio of the aluminum alloy sheets increased, the various strengthening mechanisms of the material gradually approached a limiting value, thereby reducing the difference in tensile strength between samples tested at room temperature and cryogenic temperature.
We prepared AA6061 sheets by room-temperature rolling and low-temperature aging. We tested the tensile mechanical properties of the sheets at room temperature and cryogenic (173 K) temperature. The maximum difference between the cryogenic ultimate tensile strength and room-temperature ultimate tensile strength was 50 MPa for the sheets subjected to a rolling reduction ratio of 50% and aging at 393 K for 10 h. As the rolling reduction ratio increased, the lattice friction stress, dislocation strengthening, and precipitation strengthening of the material gradually approached a limiting value, thus reducing the difference between the strengths of the samples tensile tested at room temperature and cryogenic temperature. (C) 2020 Elsevier B.V. All rights reserved.

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